/Engine/Source/Runtime/Engine/Classes/Engine/GameEngine.h
Modifies the game window resolution settings if any overrides have been specified on the command line and overrides are enabled (see EnableGameWindowSettingsOverride)
static void ConditionallyOverrideSettings ( int32 & ResolutionX, int32 & ResolutionY, [EWindowMode::Type](API\Runtime\ApplicationCore\GenericPlatform\EWindowMode__Type) & WindowMode )